Antiresonance Phenomena in the Transmission Spectra of KI : Cu Crystals

抄録

Transmission spectra of KI crystals doped with copper impurities of concentration as high as 0.02 to 1 mole per cent have been investigated. When these crystals are anneals are at above 350°C, the doped copper coagulates and forms CuI micro-crystals in the host KI lattice. The spectra show two char acteristic peaks closely to CuI exciton bands. As the concentration of copper increases, a dip appears in the high energy side of the respective peak, and the profile becomes antiresonance type. These phenomena are explained as interference effects between the exciton resonance of CuI cluster and the light scattered by the cluster dispersed in the host. The spectra are also numerically calculated on the basis of the Mie theory in classical electromagnetism. The calculated line shape is in good agreement with observed ones; the calculated antiresonance dip increases as the size of cluster becomes larger, in qualitative agreement with the experimental results.